46 



Bend Tests 



Drift Tests 



Test 

 Specimens 



11. The test specimens for plates, shapes and bars shall bend cold through 180 

 degrees without cracking on the outside of the bent portion, as follows: For material 

 3/4 inch or under in thickness, around a pin the diameter of which is equal to the thickness 

 of the specimen; and for material over 3/4 inch in thickness, around a pin the diameter 

 of which is equal to twice the thickness of the specimen. 



12. The test specimens for pins and rollers shall bend cold through 180 degrees 

 around a one inch pin without cracking on the outside of the bent portion. 



13. The test specimens for rivet steel shall bend cold through 180 degrees flat on 

 themselves without cracking on the outside of the bent portion. 



14. Punched rivet holes pitched two diameters from a planed edge shall stand 

 drifting until the diameter is enlarged 50 per cent., without cracking the metal. 



TEST SPECIMENS 



15. Test specimens shall be prepared for testing from the material in its rolled or 

 forged condition except when it is specified to be annealed ; in which case the test speci- 

 mens shall be prepared from the material as annealed for use, or from a short length of 

 a full section similarly treated. 



16. Test specimens shall be taken longitudinally, and, except as specified below, 

 shall be of the full thickness or diameter of material as rolled. 



17. Test specimens for plates, shapes, and flats may be machined to the form and 

 dimensions shown in Fig. 1, or with both edges parallel; except that bend test specimens 

 for eyebar flats may have three rolled sides. 



18. Tension test specimens for plates and eyebar flats over \ l /2 inches in thickness, 

 and bend test specimens for plates over 1^" inches in thickness, may be machined to a 

 thickness or diameter of at least 3/4 inch for a length of at least 9 inches. 



19. Test specimens for bars over \ I /L inches in thickness or diameter may be mach- 

 ined to a thickness or diameter of at least 3/4 inch for a length of at least 9 inches; or 

 tension test specimens may conform to the dimensons shown in Fig. 2, in which case the 

 ends shall be of a form to fit the holders of the testing machine in such a way that the 

 load shall be axial. Bend test specimens may be 1 x 1/2 inch in section. 



a 



Radius not lessttanjl 



Fig. 2 



Note The gauge-length, parallel portions and fillets shall be as shown; but the 

 ends may be of any form which will fit the holders of the testing machine. 



